Noise in dark areas FCPX -> Compressor 4

I use FCPX 10.0.6 with Compressor 4.
The problem which I am not able to solve is that whenever I export my project from Final Cut with Compressor, one dark shot always comes out with noise.
The different grey tones (it's in black and white shot with the canon 5d) do not seem to merge neatly but build separated zones.

This is what it looks like:

When looking at the same shot in FCPX however, it looks smooth and those lines are not there.
This is the same shot what it looks like with Final Cut:

Is multi-pass VBR the same as Two pass?
Where do i find in compressor the key frame distance?

Is there on the camera a precise option for shooting in progressive?
I shoot with mark ii at 24 frame per second with pal system.
I edited wit native camera format and the project in final cut pro it is in progressive.